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Aluminum motor mounts

need some info. i am building a set of solid motor mounts and would like to use Aluminum. what grade would be suitable? as there are quit a few to pick from. i was thinking 6061-t4 (3/16 or 1/4). here is what i was thinking.

or

also what filler and would i need to re-harden the aluminum after welding

The engines size and power will weigh into this equation. I would warn away from thin 1/4" mounts on a big block for instance. A high torque small block would be over the top for 1/4" as well. WE need more Information. All the little things matter in these decisions. Also what is the design purpose of this vehicle also. If your doing an off road truck this is a terrible idea as well.

if you make all those welds pictured in your little diagram, your 6061 will probably lose all it's temper from the heat and will end up with no more strenth than non-heat-treated aluminum. if you're dead set on aluminum, the i would machine the motor mounts from a block of 7075.

I kind of agree about not being so dead set on alum unless I copied a proven design, they are small and weight would be rather insignificant to some extent, I would be tempted to use steel unless I had to use alum.

If aluminum is the requirement, then I would step to atleast 1/2" material. I also agree that a machined block of material would have a better chance. Also if 1/" is used I would relief cut the surface to slightly recess the bolt head and thus move the strain into the block as opposed to being carried pirmarily along the surfaces.

This I believe to be a true call for steel, but as usual its my opinion.